Final answer:
An incentive is an external reward that motivates behavior, such as working extra hours for a bonus, and is a form of extrinsic motivation.
Step-by-step explanation:
An incentive is an object, person, or situation that is perceived as being capable of satisfying a need or as desirable for its own sake. In psychology, an incentive motivates behavior by serving as an external reward. For example, if someone works additional hours to receive a bonus, the bonus is the incentive that motivates the extra work. This falls under the category of extrinsic motivation, which arises from external factors or rewards. On the other hand, intrinsic motivation involves engaging in behavior for the personal satisfaction and fulfillment it brings, without any external reward.
Reflecting on the given options, the correct answer is b) Incentive.